Fiber optic knowledge
1 The tensile strength of the fiber is very high, close to the tensile strength of the metal;
2 The ductility of the fiber (1%) is worse than that of the metal (20%);
3 When there are cracks in the fiber, bubbles or debris, under certain tension, it is easy to break;
4 fiber rainwater is easy to break, and the cutting loss is greatly increased;
5 Loss increases with decreasing temperature at low temperatures;
6 Fibers need to be protected from mechanical properties and require waterproof protection to ensure transmission performance.
Wavelength: Communication window of optical fiber communication optical signal, wherein 850, 1310nm is a multi-mode fiber communication window, which is a short-wavelength window; 1310, 1550, 1640nm, etc. is single-modeĀ optical fiber communication with a long-wavelength window.
Simplex: The signal on the communication is only received or not sent, and the one-way communication is understood to be that only one optical fiber is received or only the optical signal is transmitted.
Duplex: Both receiving signals and transmitting signals, which are divided into half-duplex and full-duplex. Half-duplex can be understood as a core optical core. After receiving the signal, the signal can be sent through the same core fiber, but only at this time. Can not send signals cannot be received; and full-duplex is still using a core fiber while receiving signals can continuously send signals, receiving and transmitting two kinds of communication without interference, generally through frequency division multiplexing, time division multiplexing and waves Divided by multiplexing.
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